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<h1>About the reference section</h1>

<p>The reference section provides comprehensive information about how to use the HTML Help API commands, data structures, and notification messages. There are three sections:</p>


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<li>The <a href="ov_about_htmlhelp_commands.htm">commands reference</a> provides syntax descriptions and code examples for all commands (<i>uCommand</i> parameter values) that can be passed to HtmlHelp().  

<li>The <a href="ov_about_htmlhelp_structures.htm">structures reference</a> provides syntax descriptions for all data structures used by HtmlHelp(). 

<li>The <a href="ov_about_notification_messages.htm">notification messages reference</a> provides syntax descriptions for all notification messages sent by HtmlHelp().
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